Forum Moderators: phranque
I'm not an authority on this at all, but offhand I'd say that your requirements put you all the way up in the custom quote enterprise solution range.
Besides the software implementation it looks like you'd have a large investment in hardware. For example, Google's high end offering that can deliver 1.4 million queries per day consists of 8 rack units plus associated equipment.
I hope somebody else comes along that has a better answer.
Jim